Wireless signaling.



No. 706,743. Patented Aug. l2, I902.

R. A. FESSENDEN.

WIRELESS SIGNALING.

(Application filed June 26, 1902.)

(No Model.)

WITNESS S: INVENTOR figwafl/ (mm HQ MM' #wm w UNITED STATES PATENTOFFICE.

REGINALD A. FESSENDEN, OF MANTEO, NORTH CAROLINA.

WIRELESS SIGNALING.

SPECIFICATION forming part of Letters Patent No. 706,743, dated August12, 1902. Application filed June 26,1902; Serial No. 113,244- (Nomodel.)

To all whom it may concern:

Be it known that I, REGINALD A. FESSEN- DEN, a citizen of the UnitedStates, residing at Manteo, in the county of Dare and State of NorthCarolina, have invented or discovered certain new and usefulImprovementsin \Vireless Signaling, of which improvements the followingis a specification.

The invention described herein relates to certainimprovements insignaling by electromagnetic waves, and has for its object theutilization of the currents generated by such waves to effect chemicalchanges corresponding to the energy developed by such currents and thecontinuity of the currents.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification,Figure 1 is a sectional view of a receiving apparatus embodying myimprovement, and Fig. 2 is a diagrammatic view illustrating amodification of my improvement.

In the practice of my invention, as illus trated in Fig. 1, I employ areceiver adapted on the passage of a current through it to emitradiations which will so aifecta prepared strip within the range of theradiation as to produce a mark or character which can be interpreted orread. A convenient construction to that end consists of a loop-receiver1, as described and claimed in applications No. 110,460, filed June 6,1902, and No. 113,968, filed July 1, 1902, arranged as described in thereceiving-circuit. In order to concentrate the radiations from thereceiver onto the strip, the receiver is inclosed in a shell 2, havingopaque walls except on the side toward the strip. This side ispreferably provided with a lens 3, constructed to concentrate theradiations. At or adjacent to the focus of the lens an aperture isformed through the partition 4, and the prepared strip 5 is caused tomove past said aperture. The strip is so prepared that the impingementof the radiations-e. g., light orheatfrom the receiver will produce achange, chemical or otherwise, at the point of impingement sufficientlypermanent to enable the character-sign or symbol so produced to be read.It is preferred to employ photographic paper, which will be chemicallychanged by the light or heat radiations from the receiver. This strip iswound on a drum or spool 0, arranged in the inclosing box 7, and passesover a supporting-roller 8, arranged in such relation to the aperture inthe partition 4 as to close the same and prevent the entrance ofradiations into the compartment containing the strip. From the roller 8the strip passes around an other guide-r0ller 0 into the compartment 10,where the character sign or symbol is developed and fixed. Thedeveloping and fixing chemicals are preferably applied by means ofrollers 11 and 12, revolving in basins 13 and 14, containing theliquids, the strip being guided into contact with rollers 11 and 12 byrollers 15. Froni the fixing-rollers the strip passes, by prefer;

ence, through a chamber 16, where the strip can be dried, or partiallyso, thence through a contained slot. at any regular speed by anysuitablemeans as, for example, a clockwork-motor applied.

to one or more of the rollers with which the strip is in contact. It ispreferred to employ a concave mirror 17 to direct the radiations to thelens, as shown.

In lieu of producing chemical change by means of radiations produced bycurrents traversing a receiver the current itself may be employed forthat purpose. A convenient mechanism for that purpose consists of twopins or small rods 18 and 19, having their points resting on a strip 5,made conductive in any suitable manner and so prepared that on thepassage of acurrent generated by-electromagnetic waves inthe conductor Aa distinctive mark or character will be produced on the paper. Asstated, one of the pins or rods, as 18, is connected to the aerialportion of the conductor A, while the other pin or rod is connected toground. The pins are separated a suflicient distance to prevent thepasssage of a current direct from one pin to the other, and hence thecurrent must pass along the strip, which forms a conducting medium orpath between the pins. The strip is fed regularly over asupporting-table 20 by any suitable means. It is preferred that thestrip should be in a moistened condition, thereby increasing itsconductivity, by storing the same in a chamber of constant temperatureand humidity.

The strip is caused to move ICO It is characteristic of the inventiondescribed herein that energy produced or generated by electromagneticwaves is utilized to produce interpretable or readable characters orsigns.

I claim herein as my invention- 1. As an improvement in the art ofsignaling by electromagnetic Waves, the method herein described, Whichconsistsin producing interpretable characters or symbols on a strip orfilm by chemical action produced by currents generated byelectromagnetic waves, substantially as set forth.

2. As an improvement in the art of signaling by electromagnetic waves,the method herein described, which consists in afiecting a sensitivestrip or film by currents generated REGINALD A. FESSENDEN.

Witnesses:

DARWIN S. WoLcor'r, F. EQGAITHER.

